Single-Transducer Audio Circuit With Feedback Noise Cancellation
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Solution Overview
Problem
Current communication systems lack an efficient single transducer solution for both audio input and output functions, requiring separate microphone and speaker transducers, which increases complexity and reduces noise cancellation accuracy.
Innovation Solution
A single transducer audio in/out device with a unique audio receive/transmit circuit that functions as both a microphone and a speaker, utilizing a non-inverting operational amplifier, analog-to-digital converter, digital-to-analog converter, feedback circuit, and controlled source circuit to regulate transducer voltage and cancel noise effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate microphone and speaker transducers are used, then audio input and output functions are achieved, but device complexity increases
Solution Approach 1:
The patent combines separate microphone and speaker transducers into a single integrated transducer that performs both audio input and output functions. This merging reduces the number of components and simplifies the overall circuitry while maintaining dual functionality for audio capture and playback.
Solution Approach 2:
The integrated transducer is designed to serve multiple functions - acting as both a microphone for audio input and a speaker for audio output. This multi-functional design eliminates the need for separate dedicated transducers, thereby reducing device complexity while preserving adaptability.
2Adaptability or versatility
If separate microphone and speaker transducers are used, then audio input and output functions are achieved, but noise cancellation accuracy reduces
Solution Approach 1:
The patent implements a feedback circuit that continuously monitors the output signal and adjusts the input signal processing accordingly. This feedback mechanism enables the system to compensate for interference and improve noise cancellation accuracy by using the output information to refine the input signal processing in real-time.
Data Source
AI summary
A noise canceling audio in/out device includes an audible in/out transducer operable to convert an audible noise signal to a noise signal and convert an audio transmit (TX) signal to an audible output signal. A transducer signal of the audible in/out transducer generated by the audio TX signal is affected by the noise signal. The noise canceling audio in/out device further includes a noise canceling circuit operable to convert a digital TX signal to a TX reference signal, compare the transducer signal with the TX reference signal to produce an analog comparison signal, where the analog comparison signal includes a representation of the audio TX signal and the noise signal, and regulate the transducer signal to substantially match the TX reference signal to remove the effect of the noise signal on the transducer signal.